public class HelloWorld {
    //main-> psvm(首字母）
    public static void main(String[] args) {
        // sout
        System.out.println("hello world");
        System.out.println(10);
        // 5.sout
        System.out.println(5);
        //for i
        for (int i = 0; i < 100; i++) {
            System.out.println(i);
        }
    }
}

 